Brake.



No. 855,271. 7. PATENTED MAY 28, 1907.

. I. W. BAINBRIDGB;

. BRAKE.

. APPLICATION FILED DBO. 29, 1905.

rrn rrnn s'rarns PATENT oiunen.

RICHARD W. BAINBRIDGE, OF NEW YORK, N. Y.

BRAKE.

Specification of Letters Patent.

Patented May 28, 1907.

Application filed December 29, 1905. Serial No. 293,788.

vented new and useful Improvements in Brakes, of which the following is a specification.

This invention relates to brakes for retarding and arresting the movement of a rotary 'member by the frictional engagement of parts which are brought in contact by suitable operating mechanism.

. My invention may be employed to advan tage in brakes for use in a variety of different relations and such changes as may be necessary in the design of the parts to adapt the brake for use in'the desired connection may be made, it being understood that the principles of my invention are not limited to any particular use.

My invention contemplates the employment of a flanged member carried by the rotating part and braking devices arranged to coact frictionally with the interior and exterior surfaces of such a flange. These friction devices consist of bands having suitable friction surfaces, preferably'of such dimensions that they cover almost the entire interior and exterior surfaces of the flange, and a plurality of links extending across the edges of the flange and pivoted at their ends to the friction bands. Preferably a number of these links areprovided and they aredistributed throughout the length of the friction bands. A suitableoperating mechanism is connected to the bands and arranged to move them relatively one to the other. When thus moved the links connecting the interior and exterior bands are shifted angularly and draw the two hands together so that they engage the flange and squeeze it between them to retard and stop its rotation. throughout the length of the brake bands draw the bands together at. all points uniformly so: that the friction contact is obtained. over a large area.

I have illustrated the preferred emb0diment of my invention in the accompanying drawings in which Figure 1 is an elevation, Fig. 2 isa section on line 22 of Fig. 1 and Fig. 3 is a sectional detail on line 33 of Fig. 1. 1

Referring to these drawings, 1 indicates a shaft whose rotation is to be retarded and arrested by the brake and secured thereon is a one on either side of the spokes 2.

form almost complete circles.

band 4 is connected to each of the inner bands '5 and 6 by a plurality of links 7 distributed The links distributed I wheel consisting of spokes 2 supporting a flange 3. Extending around the exterior of tie flange 3 is a brake band 4 of approximately the same width as the flange and of such length that it forms almost a complete circle. Lying adj acent to the interior of the flange are two other brake bands 5 and 6, These are preferably of the same width as the portions of the flange between one edge and the side, of the spokes and are also of such length as to The outer throughout the length ofthe bands; these links extend across the edges of the flange 3 and are pivotally connected at their ends to thebands. v

The brake band's aresupported when not in the braking position in any suitable manner as'by a spider 8 secured on a bearing 9 for shaft 1 or some other stationary'part. The spider 8 is shown as having two arms extending upward and carrying attheir upper ends bolts 10 which extend across the exterior surface of the outer band 4. Pivoted on these bolts are links 11 which at their lower ends carry pins 12 extending through slots in proj ections 13 formed on the interior of the inner bands 5 and 6. These pin and slot connections are such that when the brake bands are in the position for free running, the inner bands 5 and 6 will fall by gravity until the pins reach the end of the slots and in this position will be supported free of the flange 3.

vWhenin this position and the operating mechanism being in such a position that the links 7 are radially disposed, the outer band 4 will also be free of the flange 3 and the brake bands will offer no resistance to the free running of the shaft.

- The operating mechanism may consist of any suitable means for moving the exterior and interior bands relatively about the shaft and thus shifting the links 7 'until they are disposed at angles to the radii of the wheels extending .through'them, I have shown, for this purpose, a lever 14 pivotally connected to the inner and outer bands and extending upward to a position convenient for the operator or to a point of connection of a suitable lever system by which the brake may be operated from a more distant oint.

The inoperative position 0 the parts is shown in Fig. 1. To move them to the braking position, the rod 15 connected to link 14 band 4 and this moves the inner bands 5 and.

6 around the interior of the flange 3. As the inner and outer bands are moved relatively thus, the links 7 are shifted and draw the bands. togetherinto frictional. engagement with the flange. As a number of these links are provided and are distributed throughout the length of the bands, the inner and outer bands are drawn together uniformly as well at their ends as at the point of connection of lever 14: and the frictional area is therefore very large, practically equal to the sum of the areas of the bands. The brake is therefore very eflicient and it will be seen that it possesses the further advantages of being self-compensating for wear of the friction.

surfaces'and of being of simple construction and hence inexpensive toproduce. To release the brake the lever 14 may be moved back to the position shown in Fig. 1 by the lever system connected thereto or a spring may be provided to move it to this position against a stop when a latch for the lever system is released.

a What I claim and desire to secure by Letters Patent is:

1. In a brake, a rotary member having a flange thereon, frictional brake bands co-operating with the interior and exterior surfaces of said flan e and movable relatively about the axis of said flange at all points throughout their lengths, links connecting said bands, and means for movin the bands relatively about the axis of the flange, substantially as described.

2. In a brake; a shaft, a wheel having a flange secured thereon, a brake band co-operat ng with the exterior of said flange, two brake bands lying parallel to each other cooperating With the interior of said flange, said innenand outer bands being movable relatively about said shaft at all points throughout their lengths, links connecting the outer band to each of the inner bands, and means for moving the inner and outer bands relatively about the axis of the shaft, substantially as described.

v3. In a brake, a rotary member having a flange thereon, frictionalbrake bands co-opsaid bands, and means for opejratingsaid le,

ver, substantially as described.

5. In a brake, a shaft, a wheel having a flange secured thereon, a brake band co-operating with the' exterior surface oil said flange, two bands lying parallel to each other and co-operating with the interior surface ofsaid flange, a plurality of links each connectiiig said outer band with one of said inner bands, and means for moving said inner and outer bands relatively, substantially as de- I scribed.

6. In a brake, a rotary member having'a flange thereon, frictional brake band's co-operating with the interior and exterior surfaces of saidflange, a plurality of links each pivotally connected to said innerand outer rake bands, means for moving said bands relatively about the axis of said flange, anda sup ort for said bands, substantially as descri ed.

'7. v In a brake, a rotary member having a flange thereon, frictional brake bands co-operating with the interior and exterior surfaces of said flange, a plurality of links each piv otally connected to said brake bands, means, for moving said bands relatively about the axis ofsaid flange, and means for supporting one of said bands when out of engagement with said flange permitting movement thereof into engagement with the flange, substantially as described.

This specification signed and witnessed this 27th day of December, 1905.

RICHARD W. BAINBRIDGE. 

